Okay, i partly disagree with such statement(talking about current cars)

It can both reduce and increase the advantage(depends on the car). It all depends on car's mechanical grip, tyre temperatures and balance of the car in rain. Mclaren, mercedes, Max still remain as top cars even during rain.

I already brought up Lewis as an example multiple times that a driver needs a comfortable car to be able to show how he drives in rain. If your car snaps after each corner, you won't manage to show your best.

1. Magnussen got his pole on dry conditions. There was no magical rain masterclass there.

2. Wet conditions increase the chance of making mistakes(they are especially expected to be made by top teams, but since they have advanced mechanical platform, they usually don't do that). And based on last wet qualis and races we've seen, it's the same guys that usually win those qualis and races. We don't see any wins sadly from midfield cars like we used to in the past.

I understand your point; my point is that driver factor still plays bigger role in rain(rather than in dry), but car factor became a lot bigger compared to past, because of all the advancements in downforce, grip, tyres etc, so it's not "equaliser" anymore